Star and heart buffs are actions taken by service sellers to increase party stars and hearts by using multiple clone accounts (alt accounts). The seller will create dozens of accounts and then enter the buyer’s party to give hearts and spam stars. This method is then repeated to get tens of thousands, hundreds of thousands or even millions of party stars. This method is quite popular among Vietnamese players
Usually the seller will sell in packages, for example 100k hearts and 1 million party stars.
This method is no longer possible because now it is necessary to connect an account (binding) to be able to give hearts and party stars
I myself have tried this method by creating dozens of alt (clone) accounts on the mobile cloud gaming site.